Fix large content viewer for DoubleTitleLabelNavigationBarTitleView

Mastodon/Scene/Share/View/Content/DoubleTitleLabelNavigationBarTitleView.swift

@@ -53,18 +53,22 @@ extension DoubleTitleLabelNavigationBarTitleView {
         containerView.addArrangedSubview(subtitleLabel)
 
         isAccessibilityElement = true
+        showsLargeContentViewer = true
+        addInteraction(UILargeContentViewerInteraction())
     }
 
     func update(title: String, subtitle: String?) {
         titleLabel.configure(content: PlaintextMetaContent(string: title))
         update(subtitle: subtitle)
         accessibilityLabel = subtitle.map { "\(title), \($0)" } ?? title
+        largeContentTitle = accessibilityLabel
     }
     
     func update(titleMetaContent: MetaContent, subtitle: String?) {
         titleLabel.configure(content: titleMetaContent)
         update(subtitle: subtitle)
-        accessibilityLabel = subtitle.map { "\(titleMetaContent.string), \($0)" } ?? titleMetaContent.string
+        accessibilityLabel = subtitle.map { "\(titleLabel.backedString), \($0)" } ?? titleLabel.backedString
+        largeContentTitle = accessibilityLabel
     }
 
     func update(subtitle: String?) {

MastodonSDK/Sources/MastodonUI/Extension/MetaLabel.swift

@@ -152,4 +152,18 @@ extension MetaLabel {
         ]
     }
 
+    public var backedString: String {
+        let string = textStorage.string
+        let nsString = NSMutableString(string: string)
+        textStorage.enumerateAttribute(
+            .attachment,
+            in: NSRange(location: 0, length: textStorage.length),
+            options: [.reverse])
+        { value, range, _ in
+            guard let attachment = value as? MetaAttachment else { return }
+            nsString.replaceCharacters(in: range, with: attachment.string)
+        }
+        return nsString as String
+    }
+
 }